Piston-packing.



- *wmvssgss 11. A. HO KE & 0. J. BARLEY.'

PISTON PACKING. Ai'rmouxon IILED 3.21; 1913. A

1,082,523, Patented Dec. 30, 1913,

A F1521 A CI F a. Z A

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IN VEN TOR:

awe Q ATTORNEY HARRY '4. HOKE AND cLARENcr. 3.

BAZB LEY, OI ALTOONA, I ZINNSYLVANIA.

fission-PAC ING.

Specification of Letters Patent.

Patented Dec. 30, 1913.

Application filed Apr-i121, 1913. Serial-No. 762,456.

To oil whom it may concern:

Be it known that we, HARRY A. Home and (En-meson J. Banner, both citizens of the United States of America, residing in Al-- toona, in the county of Blair and State of Pennsylvania, have invented a certain new and useful Improvement in- Piston-Packing, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

Our present invention relates to pistons, and particularly to the construction of the spring metal packing or snap rings employcd to prevent leakage between a piston and the-wall of the cylinder in which it works, and the manner in which these rings are mounted in the piston.

The object of the present invention is to provide simple and effective means for the purpose specified characterized by the provisions made for anchoring the snap rings to the piston hody in such manner that incase of fracture of the rings the broken apart segments cannot escape from theypis:

ton and thereby injure the latter or the cylindcr in which the piston works, but on the contrary will be held in place and still be efi'ectivc. to a degree to prevent leakage he'- tween the piston and the cylinder in which it works.

The various features of novelty which characterize our invention are pointed out with mrticularity in the claims annexed to and forming a part of this specification.

For a betterunderstandingof the invention, hmvcvcn'andof the advantages possessed by it. reference should be had to the accom panying drawings and descriptive matter 49 in which we have illustrated and described one embodiment of our invention.

, Of the drawings: Figure 1 is a sectional elevation of a piston provided with snap rings constructed and mounted in accordance with the present invention; Fig. 2 is a section on the line 2-2 of Fig. l; and Fig. 3 is apartial section taken similarly to Fig. 1. but on a. larger scale.

In the drawings we have shown our in vention embodied in a piston adapted to serve as a piston distributing valve of a locomotive. To the particular construction illustrated the piston body proper comprises a spool or barrel A expanded at, its ends to provide radially extending flange portions ring F has the usual A, against which piston heads 0 are clamped by bolts D. prises a hub portion connected by yoke or web portions C to an annular rim portion G The hub portion of each head is formed with a central passage C to receive the piston rod and with passages C and C to receive the bolts D. As shown, the passage C is threadedto receive the threaded end of one of the bolts D and the passage C is counter sunk to receive the head of the otherbolt D. Thelrim portion C of each head C is provided at its and remote from the adjacent spool flange A with an outwardly projecting radial flange por'tion C. The flange portion C and the ad acent spool flange A thus form the sides, and the periphery of the rim portion C forms the bottom of a circumferential groove, which in the assembled piston consti'uct-icn receives a bull ring E, which is secured against turning by a stud E. Each bull ring R is of a size at its inner curved surface to snugly ing flanges C and A but the outer portion of the hull ring is cut away to form a circumfereutial 'slct E having an under cut portion E between the. bull ring and the adjacent flange C or A. Each slot. E receives a corresponding spring metal packing cr 'snan ring F. Each ring F which is cut an pr't as usual at one point along its circumferunce. comprises a body portion with fiat side; fitting easily between the side of the reduced outer portion of the bull ring and the adjacent side of the adia ent flange C or A asthc case may be. and alsocomprisesalaterallv proiccting rib l at its inner edge which extends into the under cut slot portion E". referahly each 'suan ring is Z shape in cross section. as s own. the outer lateral rib or flange F prciccting over the periphery of the corresponding flange C or A as the case may be.

The parts are so proportioned that each capacity for radial movement to compcnsatc for wear and to insure the desired contact between the periphery of the snap ring and the cylinder wall in which the piston works. Moreover, in ,P:l a snap ring F breaks into two or more picces in operation curs. the pieces cannot escape from their seats in the piston and thus iniure the piston on the wa l of the cyl nder. but am held in plaice and serve to materially decrease the as sometimes 00- As shown each piston head comfit between the correspondleakage between the piston and the cylinder ring were removed. The advantages thus wall b'elowthat which would occur if the secured by our new construction are of prime importance when the piston' in which the' rings are mounted is the piston distributing valve of a' locomotive and especially a locomotive using preheated steam. In such use fractures of the snap rings are of frequent occurrence and with the snap ring constructions and mountings heretofore employed the pieces of the broken snap rings escaping from reaching the end of its run before re-v pairs are made. It will'be understood, of course, that in the particular construction illustrated it is necessary to loosen the'bolts D and to separate the corresponding head 0 from the adjacent end of the piston barrel v to .r'emo\-'e a broken or worn snap ring and to .aimer In Letters Pater 1t No. 1,082,523

insert a new snap ring.

as s'hownin Fig. 2-, the bull ring E may liave'zapiniE-mountedin it to engage the ends 0 each-'cut apart ring F and prevent the lat rfroim turning about the piston.

While inaecoi'dance with the provisions of the statutes we have illustrated and dc scribed the best-forms of our invention now know to us, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of our invention, and that under some conditions certain features of our invention may be used without a corresponding use of other features.

Having now described our invention what patentees.

Letters Patent.

-[ Ofiicial Gazette, JuZy 21, 1.914.]

we claim as new and desire to. secure by Letters Patent is:

1. In combinatioin'a piston formed with a circumferential packing ring slot having an under cutportion, and comprising rigid parts and means rigidly connecting said parts in the normal condition of the piston but releasable to permit the axial separation of the parts, one of said rigid parts forming one side wall and the other the opposite side wall of said slot, and a spring metal packing ring movably mounted in said .slot and formed with a portion projecting into the under cut portion of said slot and prevent ing the escape of the broken apart ring segments in case of the fracture of the ring but not interfering with the expansion and con-' traction of the ring in normal operation.

2. In combination, a piston comprising a body portion having a circumferential outwardly projecting flange at its end, a piston head comprising a'cylindrical rim portion one end of which engages said body portion and ,the other end of which is provided with a'circumferential outwardly extending flange whereby said flanges form the sides, and the periphery of said cylindrical rim forms the bottom of a circumferential channel, a bull ring received in said channel and recessed at opposite sides to provide a circumferential 'slot having an under cut portion at each side of the bull ring and between it and'the adjacent of said circumferential flanges," spring metal paclnng rings received one in each ofsaid slots and each formed with a lateral rib at its inn'er edge extending into the undercut portion of said slot and a lateral-flange at its outer edge projecting over the corresponding one of said circumferential flanges, and means for securing said piston head and body together.

HARRY A HOKE. CLARENCE J. BARLEY.

Witnesses:

E. M. MCNEIL, J AMES T. HANLON.

DISCLAIMER.

1,08 2,52 3.-Harry A. ffol ce and Clarence J. Blrley, Altoona, Pa. PIsToF Paomne. Patent dated December 30, 1913. Disclaimer filed July -10, 1914, by the this disclaimer to, and disclaim the entire subject matter claimed in, said leakage between the piston and the cylinder ring were removed. The advantages thus wall b'elowthat which would occur if the secured by our new construction are of prime importance when the piston' in which the' rings are mounted is the piston distributing valve of a' locomotive and especially a locomotive using preheated steam. In such use fractures of the snap rings are of frequent occurrence and with the snap ring constructions and mountings heretofore employed the pieces of the broken snap rings escaping from reaching the end of its run before re-v pairs are made. It will'be understood, of course, that in the particular construction illustrated it is necessary to loosen the'bolts D and to separate the corresponding head 0 from the adjacent end of the piston barrel v to .r'emo\-'e a broken or worn snap ring and to .aimer In Letters Pater 1t No. 1,082,523

insert a new snap ring.

as s'hownin Fig. 2-, the bull ring E may liave'zapiniE-mountedin it to engage the ends 0 each-'cut apart ring F and prevent the lat rfroim turning about the piston.

While inaecoi'dance with the provisions of the statutes we have illustrated and dc scribed the best-forms of our invention now know to us, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of our invention, and that under some conditions certain features of our invention may be used without a corresponding use of other features.

Having now described our invention what patentees.

Letters Patent.

-[ Ofiicial Gazette, JuZy 21, 1.914.]

we claim as new and desire to. secure by Letters Patent is:

1. In combinatioin'a piston formed with a circumferential packing ring slot having an under cutportion, and comprising rigid parts and means rigidly connecting said parts in the normal condition of the piston but releasable to permit the axial separation of the parts, one of said rigid parts forming one side wall and the other the opposite side wall of said slot, and a spring metal packing ring movably mounted in said .slot and formed with a portion projecting into the under cut portion of said slot and prevent ing the escape of the broken apart ring segments in case of the fracture of the ring but not interfering with the expansion and con-' traction of the ring in normal operation.

2. In combination, a piston comprising a body portion having a circumferential outwardly projecting flange at its end, a piston head comprising a'cylindrical rim portion one end of which engages said body portion and ,the other end of which is provided with a'circumferential outwardly extending flange whereby said flanges form the sides, and the periphery of said cylindrical rim forms the bottom of a circumferential channel, a bull ring received in said channel and recessed at opposite sides to provide a circumferential 'slot having an under cut portion at each side of the bull ring and between it and'the adjacent of said circumferential flanges," spring metal paclnng rings received one in each ofsaid slots and each formed with a lateral rib at its inn'er edge extending into the undercut portion of said slot and a lateral-flange at its outer edge projecting over the corresponding one of said circumferential flanges, and means for securing said piston head and body together.

HARRY A HOKE. CLARENCE J. BARLEY.

Witnesses:

E. M. MCNEIL, J AMES T. HANLON.

DISCLAIMER.

1,08 2,52 3.-Harry A. ffol ce and Clarence J. Blrley, Altoona, Pa. PIsToF Paomne. Patent dated December 30, 1913. Disclaimer filed July -10, 1914, by the this disclaimer to, and disclaim the entire subject matter claimed in, said 

